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TUV is an abbreviation for Technischer Überwachungsverein – a state-registered testing agency independent of manufacturers and operators.
Two-pipe system
There are two basic categories of pipe systems: one-pipe and two-pipe sytems. The type of system installed will have an influence on dimensioning radiators and piping. A general characteristic of a two-pipe system is that the radiators are dimensioned for the same flow temperature and the same temperature difference.